The brain as an organ of mind . 256 THE BRAIN OF QUADRUPEDS AND are more or less deeply indented in the transverse direc-tion, by a depression or groove which thus divides theminto four rounded swellings, answering to what, in higheranimals and in Man, are known as the Corpora Quadri-gemina. The cavity existing within them in lower Verte-brates now becomes reduced to a mere passage betweenthe third and fourth Ventricles. (2.) A great transverse commissure, connecting theCerebral Lobes with one another, appears as a rudi-. PiG. 69.—Brain of the Horse, outer surface. (Solly, after Leuret.) e, Ol
The brain as an organ of mind . 256 THE BRAIN OF QUADRUPEDS AND are more or less deeply indented in the transverse direc-tion, by a depression or groove which thus divides theminto four rounded swellings, answering to what, in higheranimals and in Man, are known as the Corpora Quadri-gemina. The cavity existing within them in lower Verte-brates now becomes reduced to a mere passage betweenthe third and fourth Ventricles. (2.) A great transverse commissure, connecting theCerebral Lobes with one another, appears as a rudi-. PiG. 69.—Brain of the Horse, outer surface. (Solly, after Leuret.) e, Olfactory-lobe; h, hipiiocampal lobe, or processus pyriforniis. 1, 2, 3, Lobes of the Ceie-belluin. o. Optic nerve ; m, motor occuli; p, fourth nerve ; t, fifth nerve; u, sixthnerve;/, facial nerve; /, :mditory; g, glo^so-pharyngcal; r, vagus; s, spinal-accessory ; n, hypoglossal nerve, x, Pons Varolii mcntary structure in lower Quadrupeds and graduallyincreases in size in higher representatives of this is known as the Corpus Callosum. This commissureprincipally connects the upper parts of the CerebralLobes, and soon comes to form the roof of the two great* lateral ventricles. (3.) A double commissure, known as the Fornix, appearsand gradually becomes more developed, as another boundaryof the lateral ventricles. Long erroneously described Ch.^p. XVI.] SOME OTHER MAMMALS. 257 as a double longitudinal commissure, its lialves, in reality(after a very irregular course, the direction of which variesin differen
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